21001024232 has 8 divisors (see below), whose sum is σ = 39376920450. Its totient is φ = 10500512112.

The previous prime is 21001024201. The next prime is 21001024237. The reversal of 21001024232 is 23242010012.

It can be written as a sum of positive squares in only one way, i.e., 14978332996 + 6022691236 = 122386^2 + 77606^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21001024232.

It is not an unprimeable number, because it can be changed into a prime (21001024237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1312564007 + ... + 1312564022.

Almost surely, 2^21001024232 is an apocalyptic number.

It is an amenable number.

21001024232 is a deficient number, since it is larger than the sum of its proper divisors (18375896218).

21001024232 is a wasteful number, since it uses less digits than its factorization.

21001024232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2625128035 (or 2625128031 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21001024232 its reverse (23242010012), we get a palindrome (44243034244).

The spelling of 21001024232 in words is "twenty-one billion, one million, twenty-four thousand, two hundred thirty-two".